A=2x-2+2x+4-2-2x
=-2+2x+4-2
=2x
B=3x-3+3x+3x+3
=9x
C=x-(1-x-x-1)
=x-(-2x)
=x+2x
=3x
D= 4x +6+10x + 5x + 18x + 6
=9x+12+ 10x + 18x
=9x + 12 + 28x
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A=2x-2+2x+4-2-2x
=-2+2x+4-2
=2x
B=3x-3+3x+3x+3
=9x
C=x-(1-x-x-1)
=x-(-2x)
=x+2x
=3x
D= 4x +6+10x + 5x + 18x + 6
=9x+12+ 10x + 18x
=9x + 12 + 28x
si tu peut m’éclairer parce que je n’arrive jamais à faire la différence